iFile glitched, battery drain, first time poster needs help.

First of all I want to say Hi to a community) I'm new member here, so its my first post, but I've been reading this forums for a long time now and found lots of help here. So I must say thank you!
So... Here's a problem.
Today I downloaded a big file using iFile. After it finishes downloading I pushed an "Open in iFile"... Usually is take some time to open a big files, but this time it didn't open. Battery continues to drain fast, I used removeBG but it didn't help me... Battery still draining like 8% a hour being locked. Also tryed to reboot with no luck.
Any suggestions ? Any app to kill processes? I think it still trys to open it in iFile somehow.
P.s sorry for my English, it's not my mother language ( tongue )

Thank you for you suggestion... Done it before with no luck. Also gave a few tries rebooting from UISettings.
My free RAM is at 250 maximum with no apps running. Ussually its about 300. So i guess there is something on a background.

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